APA (7th ed.) Citation

Clark, W. J. International Language, Past, Present & Future With Specimens of Esperanto and Grammar.

Chicago Style (17th ed.) Citation

Clark, Walter John. International Language, Past, Present & Future With Specimens of Esperanto and Grammar.

MLA (9th ed.) Citation

Clark, Walter John. International Language, Past, Present & Future With Specimens of Esperanto and Grammar.

Warning: These citations may not always be 100% accurate.